Improvement in steam-geneeatoes



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TO ALL WHOM I'I MAY CONCERN:

Be it known that I, JOSEPH A.. MILLER, of Providence, in the county of Providence, and State of Rhode Island, have invented a new and useful Improvement in Steam-Boilers, of which the following is a full, clearx and exact description, reference being had to the accompanying drawing, forming part of this specification, and which represents a sectional elevation of a steam-boiler constructed in accordance with my improvement.

My invention consists in a combination of a fire-box or chamber provided with a dome or upper chamber, vertical fire-tubes or ilues 'passing from the latter through the water and steam-space ofthe boiler into the Asmoke-bor or escape, and controlled, at or near their upper ends, by valves or Stoppers, to regulate or shut o' the draught through them, together with side tire-dues, connecting the rebox below the dome with the smokebox, whereby a variable character is or may be given to the boiler, so as to effect a quick or slow combustion at pleasure; areverberatory action insured to the furnace to the etectual combustion of the gases, and an improvement in the generative power of the boiler, and economy generally produced; and the invention further consists in a combination, with the smoke-tubes or ducs, of valves or Stoppers, ot' a conical form, for controlling the outlets to said ues.

Referring to the accompanying drawing, A. represents the outer shell or case of the boiler, whicln'together with `the smoke-box or chamber B above, may be of round, oblong, or other form. C is the-ire-box, to which a are the bars and D the ash-pit. Connected so as to form a closedjnnction with the outer case, and arranged at a moderate height above the water-level of the boiler, within-the smoke-box B, is a stcaiu-dcine er chamber, E, from which b is the steam-supply pipe. Extending upward from a rc-tlome, F, te the rcJJoX or chamber C, through the water-space and steam-dome E, and connecting the re-dorne with the smoke-box, above tho steam-dome, are any number or series of vertical {ire-tubes or iues G, provided at or near their upper ends with valves or Stoppers I'I, preferably of a shape resembling inverted cones, and raised or lowered in unison, by means of a lever, I, or its equivalent, so as to fully open, or partly or fully close, as required, the exit or upper ends of the tubes G. In addition to these last-mentioned tubes, are other tire-tubes J, of any suitable number, and occupying a side relationship, as it were, the same connecting the fire-chamber C, at bottom of or below the irodome, with the smoke-box B. At (say) its base, K, is a deector, or it maybe detlecting-plates, for inducing an active up-and-down circulation of water in the boiler, and at or about .the upper edge or edges of which is the usual water-level-thc water here being shown to surround the several {irc-tubes, for a portion of their height at least-ire-dome, chamber, and ash-pit ofthe boiler.

From this descriptiomit will be seen that the advantages aimed at in this, my improvement, are cicctually secured. Thus, when a quick combustion und direct through-draught is required, as on starting tho fire, or in getting up steam, or whenever a'larger or quicker generation of steam is required, the valves or Stoppers H H should be more or less raised so as to open the exit-ends of the fire-tubes G; but after the iirc has fairly burnt up, or steam raised, anda slower combustion will suice, then the valves or Stoppers II II should be lowered to close, or nearly so, the tubes G. This clicking or closing of the tubes G produces a revcrberatory action within 4 the fire-dome F, causing an up-anddown circulation of the heated gases within tho tubes G, with the exposure of their highly-heated surfaccs'to both the water and the steam to eficct generation and drying ofthe steam, and further, causing an intense heat within the re-dome F, and combustion of the gaseous products of combustion by the reverberatory action which takes place therein ou the draught being established through the side tubes or fiues'J, instead of, or more fully than as before, through the tubes G. In this way, or by these means, and by simply raising or lowering, at pleasure, the valves or Stoppers H I-I controlling the exit-ends ofthe tubes G, is a variable character given to the boiler to a greater extent, and'quicker in range or action than is or could be attained by any ordinary damper-arrangement. The conical form of the valves H H is preferred, as giving a largely-variable control to or over the smoke-tubes G.

' What is here claimed, and desired to be secured by Letters Patent, is*

.1. The combination of the fire-dome F with thc {ire-chamber C and tubes G J, arranged and operating essentially as herein set forth.

2. The arrangement of the valves H within the smoke-box for controlling the central orV fire-dome fines,

g substantially as shown and described.

JOSEPH A. MILLER.

Witnesses CHARLES SELDEN, HENRY AUSTIN. 

